Nothing wrong with prosperity. However, Osteen and some others like him in Mega churches promote and focus more on self-improvement, personal finances, and positive thinking than on repentance from sin, sanctification, and the atoning work of Jesus Christ. The Bible warns about the love of money.
If he did, I can't help thinking the emphasis would be on midget dwarf camels and super kingsize needles. Don't worry, folks, we absolutely can game the system!